On 21 Oct 2008, at 18:44, Chris Bloom wrote:
>
> Mark Reginald James wrote:
>> Nate wrote:
>>
>>>
>>> class Revision < ActiveRecord::Base
>>> belongs_to :environment
>>> belongs_to :source_revision,
>>> :class_name => 'Revision',
>>> :foreign_key => 'source_revision_id'
>>> end
>>
>> In your Revision model are you making any assignments to an
>> @environment
>> instance variable, or have you defined an "environment"
>> attr_accessor?
>> If so, rename to avoid conflict with the belongs_to.
>>
>> --
>> We develop, watch us RoR, in numbers too big to ignore.
>
> Is there a way to do this and have it use the association? I need to
> override the assoc= method of a model to make sure the assignment
> matches some predefined criteria. However, if I try to assign via
> @assoc= I get the error message about an undefined target, and if I
> use
> self.assoc= I wind up in an endless recursion until a stack overflow
> occurs.
>
> class Project < ActiveRecord::Base
> belongs_to :status, :class_name => "ProjectStatus",
> :foreign_key => 'status_code'
>
> # Updates the current project's status unless the current
> # status is greater than the new status. Status' are compared
> # using ProjectStatus::compare_status method The
> # new_project_status argument should be a ProjectStatus record
> # (i.e. ProjectStatus::SOME_STATUS)
> def status= (new_project_status, override = false)
> puts "Current status = [EMAIL PROTECTED]" #Debugging
> if override or @status < new_project_status
> puts "New status = #{new_project_status}" #Debugging
> @status = new_project_status
> else
> puts "No change in status" #Debugging
> end
> end
> end
@status needs to be an association proxy, not the raw ProjectStatus
object. easiest way out is problably to alias_method the old status=
method so that you can call it easily from your status= method.
Fred
>
>
> class ProjectStatus < ActiveRecord::Base
> has_many :project, :foreign_key => "status_code"
>
> def > (status); compare_status(status, ">"); end
> def >= (status); compare_status(status, ">="); end
> def < (status); compare_status(status, "<"); end
> def <= (status); compare_status(status, "<="); end
>
> def self.find_by_code (code)
> ProjectStatus.find(:first, :conditions => ['code = ?', code])
> end
>
> def to_s; self.status; end
> def to_i; self.id; end
>
> # Setup some shortcuts i.e. ProjectStatus::SOME_STATUS
> # will return the status record for that code
> def self.const_missing(sym)
> if s = ProjectStatus.find_by_code(sym.to_s)
> s
> else
> super
> end
> end
>
> private
>
> def compare_status (status, op)
> eval self.order.to_s + op + status.order.to_s
> end
> end
> --
> Posted via http://www.ruby-forum.com/.
>
> >
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